X87: [runtime] Replace COMPARE/COMPARE_STRONG with proper Object::Compare.

X87: [runtime] Replace COMPARE/COMPARE_STRONG with proper Object::Compare.

port 593c655a3c814277283f9fa1520d5ce59d6b019c (r30816).

original commit message:

    This removes the weird COMPARE and COMPARE_STRONG JavaScript builtins
    and replaces them with a proper C++ implementation in Object::Compare
    and appropriate wrappers Object::LessThan, Object::GreaterThan, and
    friends that are intended to be used by a true/false returning CompareIC
    in the future, as well as the interpreter.  As a short-term solution we
    provide %Compare and %Compare_Strong entry points for the current
    CompareIC that return the appropriate integer values expected by
    fullcodegen currently.

    Now the Abstract Relational Comparison is also using the correct
    ToPrimitive implementation, which properly supports @@toPrimitive.

BUG=

Committed: https://crrev.com/9155967e84718f100119539136c9b37e9c5fbcf0
Cr-Commit-Position: refs/heads/master@{#30844}

[chunyang.dai, 2015-09-21 02:25:13]

chunyang.dai@intel.com changed reviewers:
+ weiliang.lin@intel.com

[chunyang.dai, 2015-09-21 02:25:13]

PTAL

[Weiliang, 2015-09-21 08:49:52]

The CQ bit was checked by weiliang.lin@intel.com

[Weiliang, 2015-09-21 08:49:53]

lgtm

[commit-bot: I haz the power, 2015-09-21 08:50:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1353343002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1353343002/1

[commit-bot: I haz the power, 2015-09-21 09:13:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-21 09:13:16]

Patchset 1 (id:??) landed as
https://crrev.com/9155967e84718f100119539136c9b37e9c5fbcf0
Cr-Commit-Position: refs/heads/master@{#30844}